Unity Message Relay

[chuck47172]

Cisco Unity Connection version: 12.5.1.13900-35

Outlook office 365

I can relay a message to an email address but not an email distribution list. Any idea what would be stopping that?

[Ben Petroff]

I think this thread is relevant to your question:

https://community.cisco.com/t5/unified-communications-infrastructure/unity-relay-to-distribution-list/td-p/3396523

If you're using SMTP relay, the voicemail is going to be sent using SMTP without authentication. What happens to the e-mail once it leaves Unity Connection is completely out of your control as a UC admin, you'll need to check with Microsoft as they may have some policies that are blocking these e-mails.

From Microsoft's website (Option 2 for unauthenticated SMTP) https://learn.microsoft.com/en-us/exchange/mail-flow-best-practices/how-to-set-up-a-multifunction-device-or-application-to-send-email-using-microsoft-365-or-office-365

Limitations of direct send

• Direct send cannot be used to deliver email to external recipients, for example, recipients with Yahoo or Gmail addresses.
• Your messages will be subject to antispam checks.
• Sent mail might be disrupted if your IP addresses are blocked by a spam list.
• Microsoft 365 and Office 365 use throttling policies to protect the performance of the service.

[chuck47172 · Accepted solution]

Here's the fix...

My Outlook Office 365 guy modified the email distribution list group to allow external senders. 

Works like a champ now.